Okay, here is where you all slam me...
I was told by a dealer, who actually looked it up in a big, thick Honda Dealers book at a desk, the horsepower on the 919 (well, at least the 2007) is:
Advertised: 98 rear wheel hp
Actual: 108 rear wheel hp
This does make sense a bit, because I know that due to EPA regulations, most car makers used to "advertise" a lower actual horsepower rating than the engine actually produced. Fine examples were 426 hemi, 427 BBC, and so on.
But the dealer (he was actually the Sales Manager) actually showed me
where it said in his dealer book thingy that it was "advertised" at 98 hp but was actually 108.
So, who is on crack? Me or the Honda Sales Manager at Hinshaws in Auburn, WA? Because I go around town telling everyone my bike has 108 hp. I know I often seem like an idiot in the forum but I don't want to sound like one in real life.
One last note on the subject: Many people have told me, and I've read it a million places online, that TORQUE is more important than HORSEPOWER on a bike. Makes sense. It's the torque that sets you back in your seat! And it's the torque that makes it so hard to hold on to the grips when you're going through the gears. But hey, everyone "looks for" horsepower gains. I sure do! Being a (former) cam grinder, I know there are different grinds for torque and horsepower for the same cam and/or engine. Myself, I like torque!
I know, I know, my opinions are best left unposted.